settings.xml

<settings>
    <mirrors>
        <mirror>
            <!--This sends everything else to /public -->
            <id>my-mirror</id>
            <mirrorOf>*</mirrorOf>
            <url>http://my-mirror/repository/maven-public/</url>
        </mirror>
    </mirrors>
    <profiles>
        <profile>
            <id>my-mirror</id>
            <!--Enable snapshots for the built in central repo to direct -->
            <!--all requests to nexus via the mirror -->
            <repositories>
                <repository>
                    <id>maven-central</id>
                    <url>https://repo1.maven.org/maven2</url>
                    <releases><enabled>true</enabled></releases>
                    <snapshots><enabled>true</enabled></snapshots>
                </repository>
                <repository>
                    <id>clojars</id>
                    <url>https://clojars.org/repo</url>
                    <releases><enabled>true</enabled></releases>
                    <snapshots><enabled>true</enabled></snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <repository>
                    <id>maven-central</id>
                    <url>https://repo1.maven.org/maven2</url>
                    <releases><enabled>true</enabled></releases>
                    <snapshots><enabled>true</enabled></snapshots>
                </repository>
                <repository>
                    <id>clojars</id>
                    <url>https://clojars.org/repo</url>
                    <releases><enabled>true</enabled></releases>
                    <snapshots><enabled>true</enabled></snapshots>
                </repository>
            </pluginRepositories>
        </profile>
    </profiles>
    <activeProfiles>
        <!--make the profile active all the time -->
        <activeProfile>my-mirror</activeProfile>
    </activeProfiles>
</settings>